### Context

- Add context propagation through Environment Variables specification.

([#4454](#4454))
- On Propagators API, stabilize `GetAll` on the `TextMap` Extract.

([#4472](#4472))

### Traces

- Define sampling threshold field in OpenTelemetry TraceState; define
the behavior
of TraceIdRatioBased sampler in terms of W3C Trace Context Level 2
randomness.

([#4166](#4166))

### Metrics

- Clarify SDK behavior for Instrument Advisory Parameter.

([#4389](#4389))

### Logs

- Add `Enabled` opt-in operation to the `LogRecordProcessor`.

([#4439](#4439))
- Stabilize `Logger.Enabled`.

([#4463](#4463))
- Stabilize `EventName`.

([#4475](#4475))

### Baggage

- Add context (baggage) propagation through Environment Variables
specification.

([#4454](#4454))

### Resource

- Add Datamodel for Entities.

([#4442](#4442))

### SDK Configuration

- Convert declarative config env var substitution syntax to ABNF.

([#4448](#4448))
- List declarative config supported SDK extension plugin interfaces.

([#4452](#4452))

---------

Co-authored-by: Armin Ruech <7052238+arminru@users.noreply.github.com>

With this it should be possible to keep track of performance issues also
when called from wrapper tools.

This tries to adhere to the environment specification laid out in
open-telemetry/opentelemetry-specification#4454

* feat: Add OpenTelemetry tracing support

With this it should be possible to keep track of performance issues also
when called from wrapper tools.

This tries to adhere to the environment specification laid out in
open-telemetry/opentelemetry-specification#4454

* Add spans to core paths

* Add docs

* Remove too noisy span on jsonnet.Evaluate

* Remove spans on the loader level to reduce noise

* Reduce noise further

* Improve consistency